In the Apocalypse, I Have a Skinning Knife and a Blackmail System

In his previous life, Wang Yuan had stockpiled a huge amount of supplies before the apocalypse arrived. The apocalypse was exactly what it sounded like: zombies were everywhere outside. But he underestimated human nature. He was tricked by his beautiful flight-attendant neighbor and a sexy young wife from the neighborhood, and opened the door to let them in. To his surprise, the two women stabbed him to death instead. They then enjoyed his supplies without a trace of guilt and ultimately survived. Damn it! Reborn, he successfully awakens a System and gains a skinner's knife that can turn people into human leather, a blackmail System, and an arsenal of modern weapons. Wang Yuan will make those two pay.